How to prevent sabotage attacks

Dear Experts ,  

  I am working on a sabotage attack prevention project . Would request you people's expert opinion on preventing the following types of  attacks :

 1 ) excessive queries to server applications  ( other than image verification , is there any other prevention strategies ?)

 2 ) using specific keywords to spam google results

 3 ) Submitting the site to hundereds of porn directories regularly

4 ) placing URL on "bad neighborhood" sites

5 ) Rendering sites "buried" in search results

Renill
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renillAsked:
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renillAuthor Commented:
please give 20% of the points to rich and redeem me the rest of the points.. i could find it in my own ways.

Thanks
renil
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